The Influence of Electrode Microstructure on the Performance of Free-Standing Cathode for Aprotic Lithium-Oxygen Battery

详细信息    查看全文

• 作者：Chen Shen ; Zhaoyin Wen ; Fan Wang ; Xiangwei Wu ; Chunhua Chen
• 刊名：JOM Journal of the Minerals, Metals and Materials Society
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：68
• 期：10
• 页码：2585-2592
• 全文大小：2,331 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Metallic Materials
  Nanotechnology
  Crystallography
  
• 出版者：Springer Boston
• ISSN：1543-1851
• 卷排序：68

文摘

Free-standing NiCo₂O₄@Ni cathodes for aprotic lithium-oxygen batteries were synthesized through a simple hydrothermal process followed by heat treatment in the air. The morphology of the NiCo₂O₄ deposit changed from nanosheet to nanowire with the increase of hydrothermal time. Further observation revealed that the nanosheet/nanowire NiCo₂O₄ were assembled by nanoparticles with a size of 10–20 nm. The directional assembly of the nanoparticles were not affected by the reaction time. The influence of catalyst microstructure on the electrochemical performance of Li-O₂ batteries was studied. The results of battery tests in pure oxygen indicate that the cathode material with a high specific surface area, large pore volume and broad pore size distribution can facilitate the discharge reaction, leading to an improved cell performance. As a result, the cathode based on the NiCo₂O₄ nanowire array delivered a specific discharge capacity of 1682 mAh g−1 at 30 mA g−1 and a stable cyclability of 50 cycles with a capacity limitation of 500 mAh g−1.